1321256216 has 16 divisors (see below), whose sum is σ = 2831263440. Its totient is φ = 566252640.

The previous prime is 1321256179. The next prime is 1321256243. The reversal of 1321256216 is 6126521231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11796875 + ... + 11796986.

It is an arithmetic number, because the mean of its divisors is an integer number (176953965).

Almost surely, 2^1321256216 is an apocalyptic number.

It is an amenable number.

1321256216 is an abundant number, since it is smaller than the sum of its proper divisors (1510007224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321256216 is a wasteful number, since it uses less digits than its factorization.

1321256216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23593874 (or 23593870 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 1321256216 is about 36349.0882416602. The cubic root of 1321256216 is about 1097.3091850917.

Adding to 1321256216 its reverse (6126521231), we get a palindrome (7447777447).

The spelling of 1321256216 in words is "one billion, three hundred twenty-one million, two hundred fifty-six thousand, two hundred sixteen".